Journal of Polymer Science Part B: Polymer Physics

Cover image for Vol. 51 Issue 17

01 September 2013

Volume 51, Issue 17

Pages i–i, 1263–1327

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
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      Cover Image, Volume 51, Issue 17 (page i)

      Article first published online: 19 JUL 2013 | DOI: 10.1002/polb.23349

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      The synthesis of proline methyl ester substituted polyphosphazene and the biomineralization experiment in SBF, where calcium phosphates form on its surface after 24 hours of incubation, is presented on page 1318. The CaPs are also found in nanofibers prepared with this same polymer. Proline methyl ester is chosen based on the presence of this amino acid in collagen, the main component of the organic part in bone structure. In the image, Virginia P. Silva Nykänen, Mervi A. Puska, Antti Nykänen, and Janne Ruokolainen show the SEM micrograph of calcium phosphate particles entrapped in a cavity on the surface of the polymer. This feature could be seen throughout the samples after the biomineralization experiments.

  2. Communication

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    3. Communication
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    1. Laser-micromachined cellulose acetate adhesive tape as a low-cost smart material (pages 1263–1267)

      Manuel Ochoa, Girish Chitnis and Babak Ziaie

      Article first published online: 4 JUL 2013 | DOI: 10.1002/polb.23337

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      Commercially available products offer a stable platform upon which new technologies can be developed. One such low-cost multifunctional material is cellulose acetate-backed adhesive tape, whose hygroscopic behavior renders it useful as a moisture-controlled transducer. This work presents the investigation of an off-the-shelf, moisture-responsive, acetate-backed adhesive tape for fabricating smart, inexpensive, water-responsive millimeter-scale actuators via laser machining.

  3. Full Papers

    1. Top of page
    2. Cover Image
    3. Communication
    4. Full Papers
    1. Formation of star-like and linear nanofibers via controlled crystallization of poly(3-dodecylthiophene) (pages 1268–1272)

      Zhongcheng Pan, Jing Ge, Hui Yang, Juan Peng and Feng Qiu

      Article first published online: 22 JUN 2013 | DOI: 10.1002/polb.23328

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      Among conjugated polymers, poly(3-alkylthiophenes) have received the most attention because of their excellent charge carrier mobility, chemical stability, and facile preparation. The behavior of poly(3-dodecylthiophene) in aged toluene solution is reported. The nature of the polymer's seed nuclei is related to various dissolution processes, which yield star-like or linear nanofibers in the aging process. The seed nuclei are found not only to affect the morphology and length of nanofibers, but also to determine the kinetics of nanofiber formation.

    2. Kinetic topology-selective encapsulation and mixture separation by a nanocapsule with hyperbranched polyethylenimine as core and polystyrene as shell (pages 1273–1281)

      Ming Jin, Honghai Liu, Hongting Pu and Decheng Wan

      Article first published online: 20 JUN 2013 | DOI: 10.1002/polb.23329

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      Topological selectivity is critical for molecular recognition. In this study, a macromolecular reverse micelle shows excellent topology-selective encapsulation abilities and can be used for convenient separation of dyes based on size and rigidity. Although it is a kinetic selectivity, increase of the shell thickness and functionalization density can enhance the guest selectivity. Release is also found to be highly size selective.

    3. Surface and bulk ordering in thin films of a symmetrical diblock copolymer (pages 1282–1287)

      Wei Ma, Boris Vodungbo, Katja Nilles, Patrick Theato and Jan Lüning

      Article first published online: 22 JUN 2013 | DOI: 10.1002/polb.23335

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      The relationship between bulk ordering and surface morphology in thin films of an amphiphilic diblock copolymer is investigated. Upon annealing, lamella ordering in the bulk of the film is observed and the morphology of the film surface is defined by the thickness of the film: if the thickness matches the height of a lamella stack, the film exhibits a smooth surface; otherwise, an incomplete lamella forms at the film surface, the coverage of which can be quantified using X-ray reflectivity.

    4. Conformational change, intrachain aggregation and photophysical properties of regioregular poly(3-octylthiophene) in alkanes (pages 1288–1297)

      Ruttayapon Potai, Anothai Kamphan and Rakchart Traiphol

      Article first published online: 11 JUN 2013 | DOI: 10.1002/polb.23326

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      Molecular parameters such as interchain/intrachain aggregation and individual chain conformation affect the properties of conjugated polymers significantly. In this study, the conformational change of regioregular poly(3-octylthiophene) (rr-P3OT) is induced using cyclohexane and hexane as poor solvents. When the extended rr-P3OT chain in chlorobenzene transforms into a coiled conformation in cyclohexane, the decrease of conjugation length is comparable to the shortening of 6 to 9 thiophene units. In hexane, the dense packing of thiophene units causes intrachain aggregation, resulting in the increase of conjugation length.

    5. Fabrication and characterization of biodegradable polymer scaffolds adapting microfibrillar composite concept (pages 1298–1310)

      S. Simeonova, M. Evstatiev, W. Li and T. Burkhart

      Article first published online: 20 JUN 2013 | DOI: 10.1002/polb.23332

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      The creation of biodegradable scaffolds for tissue engineering often involves the use of toxic solvents, which, if not completely removed during processing, are harmful to cells. In this work, biodegradable polymer scaffolds are produced using a microfibrillar reinforced composites (MFC) manufacturing concept. Poly(L-lactide) fibrils are isolated from drawn polymer blends with nontoxic residual solvent. The MFC is adapted in the sense that, instead of melting the lower-melting component during processing, selective extraction of one of the blend constituents is applied.

    6. Phosphoric acid-doped imidazolium ionomers with enhanced stability for anhydrous proton-exchange membrane applications (pages 1311–1317)

      Zhihong Si, Fenglou Gu, Jiangna Guo and Feng Yan

      Article first published online: 22 JUN 2013 | DOI: 10.1002/polb.23334

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      A phosphoric acid-doped imidazolium-based crosslinked ionomer, intended for use as an anhydrous proton-exchange membrane, was synthesized and characterized. The composite membranes showed good chemical stability in Fenton's reagent (at 70 °C) and in phosphoric acid (at 160 °C) and high-proton conductivity under anhydrous conditions at elevated temperatures. The results suggest that this is a valuable approach for the synthesis and practical application of this kind of proton-exchange membrane.

    7. Synthesis and biomimetic mineralization of l-proline substituted polyphosphazenes as bulk and nanofiber (pages 1318–1327)

      Virginia P. Silva Nykänen, Mervi A. Puska, Antti Nykänen and Janne Ruokolainen

      Article first published online: 4 JUL 2013 | DOI: 10.1002/polb.23339

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      Polyphosphazenes represent a promising class of biomaterials due to their flexible backbone of alternating phosphorus and nitrogen atoms. Polyphosphazenes bearing l-proline methyl ester (PProP) are synthesized for a bioactive bone repair material. The bioactivity is tested in vitro using simulated body fluid, and the formation of calcium phosphates (CaPs) is detected in as quickly as 24 hours, in bulk. Electrospun fibers made of PProP show the same bioactive behavior, where CaPs are attached to the fibers, mimicking the biomineralization of collagen fibers in bone.

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